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| author | Huacai Chen <chenhuacai@loongson.cn> | 2026-04-22 10:45:12 +0300 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2026-04-22 10:45:12 +0300 |
| commit | 37e57e8ad96cdec4a57b55fd10bef50f7370a954 (patch) | |
| tree | 232dbb182d407c172a6cbf5dddcc221547f99bc1 | |
| parent | 02a6a1f9d77a816fbac01de9bfcd0e0914552f2f (diff) | |
| download | linux-37e57e8ad96cdec4a57b55fd10bef50f7370a954.tar.xz | |
LoongArch: Show CPU vulnerabilites correctly
Most LoongArch processors are vulnerable to Spectre-V1 Proof-of-Concept
(PoC). And the generic mechanism, __user pointer sanitization, can be
used as a mitigation. This means to use array_index_nospec() to prevent
out of boundry access in syscall and other critical paths.
Implement the arch-specific cpu_show_spectre_v1() to show CPU Spectre-V1
vulnerabilites correctly.
Cc: stable@vger.kernel.org
Link: https://cc-sw.com/chinese-loongarch-architecture-evaluation-part-3-of-3/
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
| -rw-r--r-- | arch/loongarch/kernel/cpu-probe.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/cpu-probe.c b/arch/loongarch/kernel/cpu-probe.c index 657bbae6c1c7..82cf426faafd 100644 --- a/arch/loongarch/kernel/cpu-probe.c +++ b/arch/loongarch/kernel/cpu-probe.c @@ -7,6 +7,7 @@ #include <linux/init.h> #include <linux/kernel.h> #include <linux/ptrace.h> +#include <linux/cpu.h> #include <linux/smp.h> #include <linux/stddef.h> #include <linux/export.h> @@ -402,3 +403,9 @@ void cpu_probe(void) cpu_report(); } + +ssize_t cpu_show_spectre_v1(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sysfs_emit(buf, "Mitigation: __user pointer sanitization\n"); +} |